![]() ![]() A couple of tablets mixed with the hottest water you have will scarify a surprising amount of crud from a tank. It pays to remove as much fuel residue as possible and modern laundry detergents are ideal. Tanks with spigot threads can be corked but screw fitted taps will need a custom plate made up from steel and a piece of rubber sheet along with the appropriate screws. Prior to derusting remove the tap(s), any tank badges and the fuel cap if it is aluminium based (check with a magnet to confirm). Whatever process you opt for read the instructions and allow the chemical to do its job, these materials don’t work instantaneously. It can also propagate more rust if it’s not properly washed out. Beware of anything contacting hydrochloric (or brick acid) although it will unquestionably attack rust it’ll also mark paint and burn your eyes. There are similar materials out there and most of them work on acidic principles that convert rust into a water-borne solute. It works by rupturing the bond between the rust and the steel leaving clean grey steel after washing out. I’ve restored more tanks than I care to remember using a very old and reliable process that’s not available in the catalogues. There are several processes and products on the market and they all have their pros and cons. If the passivation approach appeals talk to the supplier and ask how the process works, what it does, how long it’s likely to last and what testimonials they have.īy far the best method is to use a chemical process that removes the actually removes the corrosion. There are good and bad passivates out there but it’s beyond the remit of this feature to carry out a back-to-back comparison. Unless the passivate process really can lock the reactant and the existing rust onto the body of the tank chances are vibration will inevitably loosen the coating and cause the same problems as rust. Removing rust from the inside of tanks is an imperative if our bikes are to run properly but how do you do that exactly? It’s possible to buy materials that will passivate the dreaded brown scourge but these are potentially just delaying the inevitable. Both scenarios will lead to shock horror image such as this. Certain components absorb moisture and eventually dump it out allowing severe rusting to occur old tanks that have sat empty will, unless protected, rust. Modern fuel is even better than its older variant at causing problems in tanks. ![]() This month we look at how to keep fuel systems free from the dreaded brown pest. Carbs full of rust are no fun and roadside rebuilds suck.
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